[Elecraft] New Firmware (k3fw5r57) Causes Odd Sound

[ke9uw]

I updated from the r35 to r57 firmware and received reports of an almost
imperceptible but noticeable zizzy sound when I quit talking and before the
vox drops out on 80M sideband. The listeners say it sounds like a fan in the
background, but I have no fans or noise in the room.
I reloaded the r35 and the issue was gone. 
Anybody have any ideas? Elecraft?
Chuck, KE9UW



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Chuck, KE9UW
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